package org.smart4j.framework.util;


import org.slf4j.Logger;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

/**
 * Created by chinalin on 2017/3/13.
 */
public class PropsUtil {

    private static final Logger LOGGER = org.slf4j.LoggerFactory.getLogger(PropsUtil.class);

    /**
     * 加载属性文件
     */
    public static Properties loadProps(String fileName){
        Properties props = null ;
        InputStream is = null ;
        try {
            is = Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName) ;
            if (is == null){
                throw new FileNotFoundException(fileName + "file is not found") ;
            }
            props = new Properties() ;
            props.load(is);
        } catch (IOException e){
            LOGGER.error("load properties file failure", e);
        } finally {
            if (is != null){
                try {
                    is.close();
                }catch (IOException e){
                    LOGGER.error("close input stream failure", e);
                }
            }
        }
        return props;
    }

    /**
     * 获取字符型属性(默认值为空字符串)
     */
    public static String getString(Properties props,String key){
        return getString(props,key,"");
    }

    /**
     * 获取字符型属性(可指定默认值)
     */
    public static String getString(Properties props,String key,String defaultValue){
        String value = defaultValue ;
        if (props.containsKey(key)){
            value = props.getProperty(key).trim();
        }
        return value ;
    }

    /**
     * 获取数值型属性（默认值为0）
     */
    public static int getInt(Properties props,String key){
        return getInt(props, key, 0);
    }

    /**
     * 获取数值型属性(可指定默认值)
     */
    public static int getInt(Properties props,String key,int defaultValue){
        int value = defaultValue ;
        if (props.containsKey(key)) {
            value = CastUtil.castInt(props.getProperty(key));
        }
        return value ;
    }

    /**
     * 获取布尔型属性(默认值为 false)
     */
    public static boolean getBoolean(Properties props, String key){
        return getBoolean(props, key, false);
    }

    /**
     * 获取布尔型属性(可指定默认值)
     */
    public static boolean getBoolean(Properties props, String key, boolean defaultValue){
        boolean value =  defaultValue ;
        if (props.containsKey(key)){
            value = CastUtil.castBoolean(props.getProperty(key)) ;
        }
        return value ;
    }
}
